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Components of Income Tax Expense (Benefit) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components Of Income Tax Expense Benefit [Line Items]
Current					$ (17)us-gaap_CurrentIncomeTaxExpenseBenefit	$ (18)us-gaap_CurrentIncomeTaxExpenseBenefit	$ (14)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred					13us-gaap_DeferredIncomeTaxExpenseBenefit	(14)us-gaap_DeferredIncomeTaxExpenseBenefit	13us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense (benefit)	(6)us-gaap_IncomeTaxExpenseBenefit	(3)us-gaap_IncomeTaxExpenseBenefit	(1)us-gaap_IncomeTaxExpenseBenefit	(7)us-gaap_IncomeTaxExpenseBenefit	(4)us-gaap_IncomeTaxExpenseBenefit	(32)us-gaap_IncomeTaxExpenseBenefit	(1)us-gaap_IncomeTaxExpenseBenefit
United Airlines, Inc.
Components Of Income Tax Expense Benefit [Line Items]
Current					(17)	(18)	(9)
Deferred					13	1	13
Income tax expense (benefit)					$ (4)	$ (17)	$ 4

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.